<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>主轴对齐方式</title>
    <style>
        .box {
            display: flex;

            /* 主轴对齐方式默认效果 */
            /* justify-content: flex-start; */

            /* 居中 */
            /* justify-content: center; */

            /* 父级剩余的尺寸分配成间距 */
            /* 弹性盒子之间的间距相等 */
            /* justify-content: space-between; */

            /* 间距出现在盒子两侧 */
            /* 视觉效果:弹性盒子之间的间距是两端间距的两倍 */
            /* justify-content: space-around; */

            /* 各个间距都相等    */
            justify-content: space-evenly;

            height: 300px;
            border: 1px solid #000;
        }

        .box div {
            width: 200px;
            height: 100px;
            background-color: pink;
        }
    </style>
</head>
<body>
    <div class="box">
        <div>1</div>
        <div>2</div>
        <div>3</div>
    </div>
    
</body>
</html>